Tested this on Version 75.0.3770.142 (Official Build) (64-bit) .They have additional element now
<print-preview-sidebar id="sidebar"></print-preview-sidebar>
For testing in console
document.querySelector("print-preview-app").shadowRoot.querySelector("print-preview-sidebar").shadowRoot.querySelector("print-preview-header").shadowRoot.querySelector("paper-button.cancel-button").click()
with executor.executeScript
executor.executeScript("document.querySelector("print-preview-app").shadowRoot.querySelector("print-preview-sidebar").shadowRoot.querySelector("print-preview-header").shadowRoot.querySelector("paper-button.cancel-button").click();")
EDIT :: For Version 79.0.3945.88 (Official Build) (64-bit)
document.querySelector("print-preview-app").shadowRoot.querySelector("print-preview-sidebar").shadowRoot.querySelector("print-preview-button-strip").shadowRoot.querySelector("cr-button.cancel-button").click()
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